homebrew browser cannot mount files?!?

Every time I try to use the homebrew browser it says failed to mount files or something similar to that, and also when I try to use boot mii. Is there any way of fixing this promblem?

Make sure the switch on your SD card is set to "off."

it dosent have an off it has a lock an unlocked

Okay, then. Make sure its switched to "unlocked."

it is

Make sure you remove any other external devices (USB devices, GC devices, etc.)

there arent any external devices

Can you read the SD card on your PC?

yes

can anyone help me with this promblem, please & thank you.

Do you know what format it is in?

no